Canon EF-S 17-55 mm f/2.8 IS USM Lens – black

The Canon EF-S 17-55mm f/2.8 IS USM Lens is a large-aperture lens specifically designed for EF-S type digital SLR cameras, and that offers a super wide angle to short telephoto zoom range, with built-in Image Stabilization. The focal length is equivalent to approx. 27-88mm in 35mm format lens features Canon’s latest optical Image Stabilizer technology, providing up to 3-stop compensation for image blur caused by camera shake and slow shutter speeds. This ensures clear, crisp images, even in dim lightgned specifically for digital photography, the lens has specially shaped lens elements and Super Spectra coatings to suppress ghosting and flare, which can be caused by reflections off digital camera sensors: Only Canon Extension Tube EF 25 II and 12 II fit on this lens! Not suitable for 35mm film SLR cameras or digital camera with image sensor bigger than APS-C size. Only fits on the EOS Digital Rebel series, or 20D, 30D, 40D, 50D, 60D, and 7D SLR cameras.
Zoom lenses are very convenient. The equivalent of two or more fixed focal length lenses in one unit. The maximum aperture of some zoom lenses changes as you alter the focal length, but through-the-lens (TTL) metering takes this into account to give correct exposure.
To meet user demands for a fast EF-S zoom lens, Canon has specially designed a lens with a large aperture of f/2.8 for select Canon Digital SLR cameras. The large circular aperture produces a shallow depth-of-field, creating background blur that draws attention to the photographic subject.
The lens construction includes UD and aspherical elements, which deliver impressive image quality throughout the entire zoom range. Image Stabilizer lens groups shift to compensate for camera movement so that the image appears steady on the image plane, ensuring clear, crisp images, even in dim light.
With a Ring-type USM, inner focusing and innovative AF algorithms, this lens achieves autofocus quickly and quietly, and with full-time mechanical manual focusing, manually adjusting the focus is possible even in AF mode.